Accidentally Knocked Up My Sister

by Amber FoxxFire

For real! I thought my 18-year-old sister, Sarah, was my step-sister. We'd been going at it ever since the moment she turned 18. We were like mad, rabid animals. We had to have each other constantly.

But I never really saw her as a sister. In fact, the more we fucked, the more I thought about her as my girlfriend.

I wanted to be with her all the time. I couldn't get enough of her. We made out constantly, even when Mom and Dad were around. We couldn't keep our hands off of each other.

But it wasn't until we did a 23 & Me test did we learn the shocking truth: that we were brother and sister.

"We should probably stop seeing each other," I said, crestfallen.

Sarah had a tear in her eye. She looked down and shook her head. "It doesn't matter. It's already too late."

"What do you mean? What's already too late?"

"Well, um, I'm pregnant." She admitted sheepishly.

I stared at my naked, 18-year-old sister for several minutes just trying to comprehend what she'd just said.

"When did that happen?" I inquired softly, trying to keep my emotions in check.

"Remember several weeks ago when I told you I'd run out of birth control pills and couldn't get any more until Monday?"

I nodded, remembering that exact moment. Hearing her say those words that if we fucked she might get pregnant did something to my brain. It broke me. The thought of knocking my step-sister up (I didn't know she was my sister then) was just too much to bear.

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